Gymnast MyKayla Skinner claims Simone Biles mistreated her amid a growing feud over Riley Gaines and transgender athletes in sports.

Olympian and former University of Utah athlete MyKayla Skinner has weighed in on the social-media spat between Simone Biles and Riley Gaines, saying that she was “belittled” and “ostracized” by Biles, her former teammate. She did not offer specifics.

Gaines, a former collegiate swimmer turned right-wing activist, has clashed with Biles online while campaigning against transgender women in sports.